Metal cutting shear



Jan. 26, 1932.

K. w; NEBKEL ETAL- METAL CUTTING SHEAR Filed June 25, 1930 2v sheets-sheet 1 Jan. 26, 1932 K. w. NEBEL ETAL 1,

METAL C-UTTING SHEAR Filed June 25, 1.930 '2 Sheets-Sheet 2 buezflr E WQVZeZ j B. 563% Z2361? ma m Patented Jan. 26, 1932 UNI-TED STATES PATENT OFFICE,

. V r KURT W. REBEL AND BLL'IASAB SGHU'BEB'I, Oil CHIGAGO, ILLINOIS KEI'AI: CUTTING l Application am June 25, mac. serm 1T0. maeaa retion, as indicated at 76 to produce the Our invention relates to metal cutting shears and more particularly to that class of shears desi ated as the throatless type, and my main ject is'to design a shear of this kind which will cut curves with the use of the conventional straight blades. i

A further object of the invention is to 'design the bed of the novel shear with a peculiar inclination suitable for the feeding and travel of the work necessary for the cutting of curves. 1 r i g A still further object of the invention is to construct the novel shears with a bed which centers on a frontal post, leaving-a maximum amount of sweep room back of the post. Another object of the invention is to design the cutters of the shearwith receding backs, in order to facilitate the departure of vmetal already cut for purposes of clearance.

'An additional object of the invention is to adapt the same readily for anhold-down element, which prevents the work from upsetting and becoming wedged between the cutters.

A final but nevertheless important object is to construct the novel shear on lines of exceeding simplicity and ruggedness, whereby to enable it to be produced economically and prove durable over a long period.

80 'With the above objects in view and any others that may suggest themselves from the specification and claims to follow, a better understanding of the invention may be had by reference to the accompanyingdlaw g i 86 inwhich- V Figure 1 is a frontal perspective view of the novel shear;'.and Fi 2 is a rear perspective view thereof. Re erring specifically to the drawings. 5

denotes the base plate of the novel shear, the same being made with holes 6 for attachment upon any bench or other stationary object.

As shown, the base plate 5 is elongated from 3 front to rear, the forepart being built up with a post .7 of massive proportions. This post is preferably at one side of the plate, in order to allow suflicient space for the frontal hole 6.

The upper part of the post 7 is gradually enlarged to form a flat top 7a, and extended with sufiicient thickness in a rearward d1- 8 of the shear. The bed 8 extends rearwardly in a horizontal course to a position back of .the rear end of the plate 5, assuming a transverse course to a point somewhat beyond the right-hand lateral limit of, the plate 5 as to lend the bed a U-form. As viewed from the front, the bed 8 has a perceptible inclination from the right-handside to the left-hand side. The slope of the portion adjacent the post 7 is rather gradual, but that of the portion 8?) is more pronounced as we have tried to indicate in Figure 1.

The bed portion 86 is built up at the front 1 viewed from the front as indicated at a e- I turning forwardly with a section 86', whereby front ends of the links are perforated for a transverse bolt 14 secured by a nut 15, and

receive between them the sector shaped bot tom end 16a of a longitudinal arm 16, a short portion of which has only been shown due to lack of space. The sector 16a is-cut with gear teeth 16b to mesh with gear teeth 10a formed in the front end of the frame plate 10. Thus, when the arm 16 is used as a handle and swung from a steep angle to asub stantially horizontal position, 'the links 12 .are caused to swing downwardly; and a return movement of the arm 16. necessarily raises the The left-hand link 12 is materially thickened toward the front end as indicated at 12a, and is made with a branch extending rearwardly at an acute angle to the link, as clearly shown in Figure 2, this branch constituting a tongue 17. The inner bottom edge 17 a of the tongue is sh to form a cutter, and the free portion of the tongue is rounded from the edge 17a as indicated at 17 b to form an elevation leading approximately to the inclined level of the bed portion 8b. -The enlarged link 12 is, of

course, made of sufiiciently hard metal to permit the tempering of its ed 17 a for the cutting-of metal. Opposite ti: tongue 17,

the bed 8 receives a cutter strip 18, screws 19 serving to secure the same firmly in a top recess 18a cut in the bed. It is understood that the strip 18 is of hard steel, suitably tempered for cutting metal and is separate from the bed to permit the latter to be made of malleable iron or other metals suitable for supports or other stationary members. It will be noted in Figure 2 that the cutting edge 18?) of the strip is in line for shearing contact by the tongue edge 17a; and in Figure 1, it is seen that the edge18b recedes curvedly toward the bottom of the strip 18, as indicated at 18c. v

The frame plate 10 is formed with a lateral top bracket 10?) which is vertically bored near its outer end to receive the screw portion 19a of a rod 19 depending to a position in proximity to the cutter strip 18. The screw portion 19a of the rod receives a nut 20 below the bracket 10b and a wing nut 21 above the same. The rod 19 is intended as a holddown element for work placed on the bed, vertical adjustment of the rod being secured by manipulating the wing nut 21. When a suitable adjustment has been reached, a wrench may be applied to the nut 20 to lock the rod in set position.

-A shear of the above type is suitable in different sizes for cutting sheet metal of any thickness up to a quarter inch. Assuming agiven piece of sheet metal is to be cut on a curved line or in a direction involving curves,

. angles or an irregular course, it need simply be fed to the space between the cutters as deeply as possible. As initially fed, the sheet rests with its left-hand portion upon the bed portion, and the right-hand por tion will nestle under the elevated bed portion 8?). Assuming that the cutters are separated, the arm 16 may now be brought down to negotiate a cut, the work sheet being swung in one or the other direction to turn the cut alon the desired course. In case the work requires swinging to the left, it will be seen that the edge justcut will begin to climb on the elevation 17?) of the tongue 17, and continue to do so, as the expanse of the work rests on the bed 8 and advances on the bed portions 8a and 825. It will be noted that the cutting area and the neck 9 serve as a center of operations relative to the work sheet, the latter turning as the course of the cut may dictate. Conversely, should the initial course of the cut require the work to be swung to the right,

it willv be seen that the advancing part of the work sheet will continue to travel beneath the portion 86 of the bed, advancing under the portion 8a and then under the portion 8 in a sweep about the post 7 without resistance or impediment. The course of the work just described is aided by the fact that the edge which is being cut is deflected in a downward direction by'the undercut and curved cutter formation 180, so that the said edge receives measles its start and its deflected course from the said formation. Needless to say, the hold-down rod 19 is in a position sufiiciently central of the work to hold the same down while permitting it to take its shape in one or the other direction.

It will be seen that we have rovided a machine which, although employing the age-old straight type of shear, permits the cutting of curves or other irregular courses in sheet metal with case. The novel machine is made with its supporting position foremost in order to afford the greatest amount of freedom and sweep room to the rear of the cutting area, where the stock must travel in order to provide clearance for the cut. At the same time, the machine is of the utmost simplicity, and unusually rugged in order that it may be operated without difficulty and prove dependable while in use. Finally, the machine retains the desirable nature of portability for easy mounting at any place, and is of a construction to be produced inexpensively.

VJ e claim:

1. A shear comprising a bed plate of substantially U-form, a tongue operable relative to one of the plate arms, and a support for the bed plate depending from the free end of said arm.

2. The structure oi claim 1, said arm being in'a substantially horizontal plane and rising by way ofits connection with the other arm to impart to the latter a gradual elevation in a transverse direction of departure from the first mentioned arm. a

3. Thestrueture of claim 1, said arm being in a substantially horizontal plane and rising by way of its connection with the other arm to impart to the latter gradual elevation in a transverse direction of departure from the first mentioned arm, and said tongue being transversely built up from its cutting edge with a gradual curvature leading to said elevation.

4:. A shear comprising a. U-shaped bed plate, a frame plate built on one of the plate arms, links alongside and pivoted to the frame plate, and a tongue extended from one of the links and operated relative to the other arm by the movement of such link.

5. The structure of claim. 4 said frame plate having gear teeth in its edge, and a hand lever pivotally connected to the links remotely from their connection with the frame plate, said lever having gear teeth tongue pivoted from the rear portion of the meshing with the frame plate gear teeth,

- the plate arm disposed opposite to the arm neck of small cross-sectional area rising from,

frame other arm.

7.. A shear comprising a U-shaped elongated bed plate, a frame plate-built on one of the plate arms, links alongside and pivoted to the frame plate, a tongue extended. from one of the links and operated relative to the other arm by the movement of such link, and a sup ort for the bed plate, said support being 7 the front of the bed plate-and integral with carrying the frame plate.

8. A shear for sheet material comprising a bed'plate of substantially U-form, one arm of the plate being higher than the other, a

the free end of said higher arm, an elevated support, extended from said neck, and a tongue carried by the support and operable relative to the other arm, the top surface of the bed plate being free beyond said neck tilt till

to permit the material to pass over the other arm and the tongue and bontinue in a sweep about said neck pursuant to a curved or irregular cut in the corresponding direction.

9. A shear tor sheet material comprising an elevated bed plate of substantially U- :Eorm, one arm of the plate being hi her than the other, a tongue between the p ate arms and operable relative to the other arm, and a est of small cross-sectional area depending rom the free end of said other arm as a supfort tor the bed plate, the balance of the atter being free on its under side to permit the material to nestle under the higher arm after the out and continue in a sweep about the post pursuant to'a curved or irregular out in a corresponding direction.

In testimony whereof we affix our signaturesi KURT NEBEL. BALTASAR SGHUBERT.

plate and operable relative to the I isposed underneath and at- 

